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A309810 as a simple table

na(n)
12
23
34
45
56
67
78
89
910
1011
1112
1213
1314
1415
1516
1617
1718
1819
1920
2021
2122
2223
2324
2425
2526
2628
2730
2831
2932
3033
3134
3236
3338
3439
3540
3642
3743
3844
3946
4047
4148
4249
4351
4452
4556
4657
4760
4862
4964
5066
5167
5268
5369
5472
5575
5676
5778
5880
5984
6086
6188
6292
6393
6494
6596
66100
67102
68104
69112
70114

[2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,
 21,22,23,24,25,26,28,30,31,32,33,34,36,38,39,40,
 42,43,44,46,47,48,49,51,52,56,57,60,62,64,66,67,
 68,69,72,75,76,78,80,84,86,88,92,93,94,96,100,102,
 104,112,114]